document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=888820>Question 888820</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi!  Thanks for your help<BR>\n" );
document.write( "Do you know if there's an online tool that generates a quadratic formula given the vertex and one point?<BR>\n" );
document.write( "I know the parabola goes through (-1,3) and the vertex is (2, -4). I tried this:<BR>\n" );
document.write( "f(-1)=3=a(-1-2)^2 - 4 ==>I got a=7/9...then I did this<BR>\n" );
document.write( "f(x)=7/9(x-2)^2+-4.    And so I'm supposed to give answer in standard form.<BR>\n" );
document.write( "I got 7/9x^2 - 3+1/9x + 7+1/9.   An online program says my answer is wrong<BR>\n" );
document.write( "(I'm 53 yr old - just trying to learn math. Thanks!) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #537719 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=537719\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> google \"vertex and point\"<BR>\n" );
document.write( "You will get many ways to do it.\r<BR>\n" );
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document.write( "y=a(x-h)^2+k<BR>\n" );
document.write( "where (h,k) is the vertex, substitute for x,y,h and k \r<BR>\n" );
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document.write( "3=a(-1-2)^2-4<BR>\n" );
document.write( "3=9a-4<BR>\n" );
document.write( "7=9a<BR>\n" );
document.write( "a=7/9<BR>\n" );
document.write( "solve for a\r<BR>\n" );
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document.write( "Substituting into the original again for a and the vertex \r<BR>\n" );
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document.write( "y=7/9(x-2)^2-4<BR>\n" );
document.write( "Good so far\r<BR>\n" );
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document.write( "y = 7/9x^2-28/9x-8/9<BR>\n" );
document.write( "Don't give up 53 is young.\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );